Not astroturf exactly

Hmm. Prominent Conservative Radio Hosts Planted Scripted Actors Among Callers | Crooks and Liars: "“Premiere On Call is our new custom caller service,” read the service’s website, which disappeared as this story was being reported (for a cached version of the site click here). “We supply voice talent to take/make your on-air calls, improvise your scenes or deliver your scripts. Using our simple online booking tool, specify the kind of voice you need, and we’ll get your the right person fast. Unless you request it, you won’t hear that same voice again for at least two months, ensuring the authenticity of your programming for avid listeners.”"